While it’s unlikely you’ll encounter any legitimately dangerous animals during your visit, that doesn’t mean they aren’t out there. Here are the most dangerous terrestrial creatures in Belize. Fortunately, they’re far less likely do bite humans than the Fer De Lance — because they have the second-most potent venom of any species. Black WidowThe black widow is the most dangerous spider in North America, but it can also be found in Belize. They’ll normally only inject a small amount of poison at a time and may even dry bite humans.